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Subject[RFC PATCH 3/4] usb: dwc3: Add device property consolidate-sgl
This commit adds the consolidate-sgl property to enable quirk for the
XHCI driver with Synopsys xHC. This property is enabled as initial
property for the dwc3-haps driver.

Signed-off-by: Tejas Joglekar <joglekar@synopsys.com>
---
drivers/usb/dwc3/core.c | 2 ++
drivers/usb/dwc3/core.h | 2 ++
drivers/usb/dwc3/dwc3-haps.c | 1 +
drivers/usb/dwc3/host.c | 5 ++++-
4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index edc17155cb2b..de1747c78cd6 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1296,6 +1296,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
"snps,usb3_lpm_capable");
dwc->usb2_lpm_disable = device_property_read_bool(dev,
"snps,usb2-lpm-disable");
+ dwc->consolidate_sgl = device_property_read_bool(dev,
+ "snps,consolidate-sgl");
device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
&rx_thr_num_pkt_prd);
device_property_read_u8(dev, "snps,rx-max-burst-prd",
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 6846eb0cba13..d6e15f75809e 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1007,6 +1007,7 @@ struct dwc3_scratchpad_array {
* not needed for DWC_usb31 version 1.70a-ea06 and below
* @usb3_lpm_capable: set if hadrware supports Link Power Management
* @usb2_lpm_disable: set to disable usb2 lpm
+ * @consolidate_sgl: set to enable the SG list consolidation
* @disable_scramble_quirk: set if we enable the disable scramble quirk
* @u2exit_lfps_quirk: set if we enable u2exit lfps quirk
* @u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
@@ -1206,6 +1207,7 @@ struct dwc3 {
unsigned dis_start_transfer_quirk:1;
unsigned usb3_lpm_capable:1;
unsigned usb2_lpm_disable:1;
+ unsigned consolidate_sgl:1;

unsigned disable_scramble_quirk:1;
unsigned u2exit_lfps_quirk:1;
diff --git a/drivers/usb/dwc3/dwc3-haps.c b/drivers/usb/dwc3/dwc3-haps.c
index 3cecbf169452..495815081576 100644
--- a/drivers/usb/dwc3/dwc3-haps.c
+++ b/drivers/usb/dwc3/dwc3-haps.c
@@ -29,6 +29,7 @@ static const struct property_entry initial_properties[] = {
PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
+ PROPERTY_ENTRY_BOOL("snps,consolidate-sgl"),
PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
{ },
};
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index 86dbd012b984..2de8f3f74b93 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -44,7 +44,7 @@ static int dwc3_host_get_irq(struct dwc3 *dwc)

int dwc3_host_init(struct dwc3 *dwc)
{
- struct property_entry props[4];
+ struct property_entry props[5];
struct platform_device *xhci;
int ret, irq;
struct resource *res;
@@ -95,6 +95,9 @@ int dwc3_host_init(struct dwc3 *dwc)
if (dwc->usb2_lpm_disable)
props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");

+ if (dwc->consolidate_sgl)
+ props[prop_idx++] = PROPERTY_ENTRY_BOOL("consolidate-sgl");
+
/**
* WORKAROUND: dwc3 revisions <=3.00a have a limitation
* where Port Disable command doesn't work.
--
2.11.0
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